verb - to do something harmful to someone just because they have done something harmful to you

noun - a positive side of something that is negative

noun - a layer of material that covers the inside surface of something

noun - an alcoholic drink made from honey

adjective, formal - feeling a great desire for revenge

noun - a space at the beginning of a paragraph

adjective - facts or ideas expressed clearly and in a few words

verb, formal - to find out the truth especially by making a considerable effort

verb - to try to spend less money, time, or material on something that you really need

noun, informal - giving too much attention to small details that are not important

adjective - something that can only be understood in one way

adjective - unharmed, not being injured after a dangerous situation

adjective, formal - not easily noticed (in a good way)

noun - (especially in combination with 'dental') a person whose job is to clean people's teeth

adjective - not flowing or moving (water, air etc.)